ASoC: Intel: byt_rvp_platform_data can be static

sound/soc/intel/sst/sst_acpi.c:124:26: sparse: symbol 'byt_rvp_platform_data' was not declared. Should it be static?

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>